Part A
74VHC541FT
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 5516 Stückzahl
- Package
- TSSOP-20
- Series
- Logic c Puffer, Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The 74VHC541FT and 74VHC240SJX are both VHC-family octal buffers with 5 V-tolerant inputs and similar AC performance, but they are not pin-compatible drop-in replacements. The 74VHC541FT provides non-inverting 3-state outputs in a TSSOP-20 package, while the 74VHC240SJX provides inverting 3-state outputs in an SOIC-20 package. Designers must account for the inverted logic polarity and the different land pattern before substituting one for the other.
Logic Function
Validation required
Output Type
Validation required
Package Type
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
74VHC240SJX
Onsemi
- Lifecycle
- Active
- Stock
- 9040 Stückzahl
- Package
- SOIC-20
- Series
- Logic c Puffer, Treiber, Empfänger, Transceiver
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC541FT | 74VHC240SJX | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver with 3-state outputs (non-inverting) | Octal Buffer/Line Driver with 3-state outputs (inverting) | Determines signal polarity; non-inverting vs inverting outputs are not functionally interchangeable in a circuit. |
| Output Type | 3-State, non-inverting | 3-State, inverting | Affects the logic level presented at the output relative to the input, impacting circuit behavior. |
| Enable Control | Two active-low output enable pins (OE1, OE2) | Two active-low output enable pins (1OE, 2OE) | Both use active-low enables, but pin arrangement and grouping differ, affecting board layout and control logic. |
| Package / Mounting | TSSOP-20 (surface mount) | SOIC-20 (surface mount) | Different package footprints require different PCB land patterns; not drop-in compatible. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both support the same wide VCC range, allowing use in 2.5 V, 3.3 V, and 5 V systems. |
| Propagation Delay (tpd) | ~5.5 ns at 5 V (typical) | ~5.5 ns at 5 V (typical) | Similar speed performance; timing-critical designs should verify against datasheet limits. |
| Output Drive Current | ±8 mA at 5 V | ±8 mA at 5 V | Matching drive strength supports similar fan-out and line-driving capability. |
| Number of Channels | 8 | 8 | Same channel count allows equivalent bus width handling. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings suit industrial and commercial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC541FT | 74VHC240SJX |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Buffer, Non-Inverting | Buffer, Inverting |
| Number of Elements | 1 | 2 |
| Number of Bits per Element | 8 | 4 |
| Output Type | 3-State | 3-State |
| Current - Output High Low | 8mA, 8mA | 8mA, 8mA |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC541FT and the 74VHC240SJX?
The 74VHC541FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC240SJX is an octal inverting buffer/line driver with 3-state outputs. The key difference is logic polarity: the 541 passes signals non-inverted, whereas the 240 inverts them.
Are the 74VHC541FT and 74VHC240SJX pin-compatible?
No. Although both are 20-pin devices, the 74VHC541FT (TSSOP-20) and 74VHC240SJX (SOIC-20) have different pinouts. The 541 has all inputs on one side and outputs on the other, while the 240 has inputs and outputs arranged in pairs with inverting outputs. They are not direct drop-in replacements.
What are the package differences between the 74VHC541FT and 74VHC240SJX?
The 74VHC541FT is supplied in a TSSOP-20 package, while the 74VHC240SJX is supplied in a SOIC-20 (SOP-20) package. These packages differ in physical dimensions, lead pitch, and PCB land pattern requirements.
Do both devices operate at the same supply voltage range?
Yes. Both the 74VHC541FT and 74VHC240SJX are VHC-family CMOS devices specified for a supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5 V.
Can the 74VHC541FT and 74VHC240SJX be used interchangeably in a design?
No. Because one is non-inverting and the other is inverting, and because their pinouts and packages differ, they cannot be used interchangeably without redesigning the circuit and PCB layout. Logic polarity inversion alone would change system behavior.
What are the output drive characteristics of these devices?
Both the 74VHC541FT and 74VHC240SJX provide standard VHC-family output drive, typically ±8 mA at 5 V VCC. They are intended for driving moderate capacitive loads and standard CMOS/TTL inputs.
Are the 74VHC541FT and 74VHC240SJX qualified for automotive or industrial applications?
These specific part numbers are standard commercial-grade devices. Automotive-qualified versions, if available, would carry different part numbers and should be verified against the manufacturer's official datasheet and qualification reports.